Unattended graffiti will breed more. Please address this.

Toronto contains some of the most beautiful artistic graffiti I have seen in my travels - there's a stretch of TTC track on the west end that adds tremendous amounts of beauty and style to an otherwise dreary subway ride. But the spray paint on this city flower box is a tacky eyesore.

The city flower boxes on Bloor East are regularly replanted and maintained, so how come this area is an issue?